Roth BW-HE
Installation
Operation
49013310
*49013310*
BW-HE
Commissioning
EN
Thank you for buying this product.
Please read this manual carefully to get the best performance from this unit.
Please keep this manual carefully.
Manual
BW-HE
Safety advice
Please pay attention to the following
safety advice in order to avoid danger
and damage to people and property.
Instructions
Attention should be paid to valid national and local regulations, standards,
directives and safety advice.
Target group
These instructions are exclusively
addressed to authorised skilled personnel.
-Only qualified electricians should
carry out electrical works.
-Initial installation must be effected
by qualified personnel named by the
manufacturer
Table of contents
Safety advice............................................................................................ 18
Description of symbols........................................................................... 18
Information about the product.............................................................. 18
Disposal
............................................................................................... 18
1. Overview............................................................................................ 19
2. Installation.......................................................................................... 20
2.1
Mounting.....................................................................................................20
2.2
Electrical connection................................................................................20
3. Operation and function.................................................................... 21
3.1
Adjustment buttons.................................................................................21
3.2
Menu structure..........................................................................................22
3.3
Operation...................................................................................................24
3.4
User code...................................................................................................24
4. Display mode..................................................................................... 25
4.1
Status, measurement values, balance values........................................25
4.2
Balance values............................................................................................26
5. Functions and options....................................................................... 26
6. Messages............................................................................................. 29
7. Troubleshooting................................................................................. 30
8. Accessories......................................................................................... 32
Imprint
............................................................................................... 32
Description of symbols
WARNING!
Warnings are indicated with a
warning triangle!
Signal words describe the danger that may occur, when it
is not avoided.
•• Warning means that injuries or even danger of life
can occur.
•• Attention means that damage to the appliance can
occur.
Nota
Notes are indicated with an information symbol.
Disposal
•• Dispose of the packaging in an environmentally sound
manner.
•• Dispose of old appliances in an environmentally sound
manner. Upon request we will take back your old appliances bought from us and guarantee environmentallyfriendly disposal of the devices.
|2
Information about the product
Proper usage
The controller may only be used in the collector circuit of
solar thermal systems in compliance with the technical data
specified in these instructions.
Improper use excludes all liability claims.
CE-Declaration of conformity
The product complies with the relevant
directives and is therefore labelled with the
CE mark. The Declaration of Conformity is
available upon request, please contact the
manufacturer.
© 10341 Roth_BW_HE.monen.indd
Subject to changes. Errors excepted.
BW-HE
1. Overview and technical data
• Full graphic display with intuitive symbols
• Up to 3 temperature sensors Pt1000
• PWM output for high-efficiency pump
• Function control
• Graphic balancing functions
172
30
62
The BW-HE is designed for controlling high-efficiency
pumps in standard solar thermal systems. The controller has various functions such as speed control, collec­tor
emergency shutdown, tube collector function and is equipped with the VBus® for data communication.
46
© 10341 Roth_BW_HE.monen.indd
110
Technical Data
Housing:
plastic, PC-ABS and PMMA
Protection type: IP 20 / DIN 40050
Ambient temp.: 0 ... 40 °C
Dimensions: 173 x 110 x 47 mm
Mounting: wall mounting, also suitable
for mounting into patch panels
Display: full graphic display for visua­
lisation
Operation: 3 push buttons at the
front of the housing
Includes:
1 x BW-HE solar controller
1 x collector sensor FKP6
1 x store sensor FRP6
1 x accessories bag
Functions: differential temperature
controller with add-on functions. Function control, operating hours counter
for the solar pump, tube collector function and heat quantity measurement.
Inputs: 3 temperature sensors Pt1000
Outputs: 1 semiconductor relay,
1 PWM output
Bus: VBus®
Power supply: 220 ... 240 V~
Standby power consumption:
1,94 W
Mode of operation: type 1.y
Switching capacity:
semiconductor relay:
1 (1) A 240 V~
3|
BW-HE
2.
Installation
WARNING!
Always disconnect the controller
from power supply before opening the housing!
2.1 Mounting
display
The unit must only be located in dry interior locations. It
is not suitable for installation in hazardous locations and
should not be placed close to any electromagnetic fields.The
controller must additionally be supplied from a double pole
switch with contact gap of at least 3 mm. Please pay attention to separate routing of sensor cables and mains cables.
cover
push button
cable conduit with
strain relief
fuse
130
fastening
1. Unscrew the cross-head screw from the cover and remove it along with the cover from the housing.
2. Mark the upper fastening point on the wall and drill and
fasten the enclosed wall plug and screw leaving the head
protruding.
3. Hang the housing from the upper fastening point and
mark the lower fastening point through the hole in the
terminal box (centres 130 mm). Drill and insert the lower
wall plug.
4. Hang the housing from the upper fastening point and
tighten lower fastening screw.
base
fastening
2.1 Electrical connection
Sensor allocation
Tcol (S1)
1
2
sensor
collector
Tstb (S2)
3
4
sensor store,
bottom
Tstt (S3)
5
6
sensor store,
top
VBus
7
8
PWM
9
10
ground output
11
|4
PE
12
13
Pump (R1)
14
15
N
L
Mains
16
17
N
L
HE pump
mains
© 10341 Roth_BW_HE.monen.indd
Relay allocation
BW-HE
fuse
HE
1
sensor terminals
control terminals
load terminals
(R1)
ground terminals
mains terminals
High-voltage components
Electrostic discharge can cause damage to
electronic components.
The power supply to the controller must be carried
out via an external power switch (last step!) and the
supply voltage must be 220 ... 240 V~ (50 ... 60 Hz).
The controller is equipped with 1 semiconductor relay to
which the HE pump can be connected:
• Relay 1
15 = conductor R1
14 = neutral conductor N
13 = ground terminal
• The terminals marked "PWM" are control outputs for the
high-efficiency pump.
Pay attention to the polarity of the PWM signal:
9 = ground 1
10 = PWM output
• The VBus® is connected to the terminals marked „VBus“
• The temperature sensors (S1 to S3) have to be connected with any polarity to the following terminals:
S1 = sensor 1 (sensor collector )
S2 = sensor 2 (sensor store base)
S3 = sensor 3 (sensor store top)
• The mains connection is at the terminals:
16 = neutral conductor N
17 = conductor L
11 = ground terminal
© 10341 Roth_BW_HE.monen.indd
Note:
If no indication is made on the display, this could
be caused by different faults. See ch. 7 “Troubleshooting” for further help.
3.
Operation and function
3.1
Adjustment buttons
1
forwards
3
SET
(selection-/
adjustment mode)
2
backwards
The controller is operated by means of the 3 push buttons
below the display. Button 1 is used for scrolling forward
through the menu or to increase the adjustment values.
Button 2 is similarly used for scrolling backwards and reducing values. Button 3 is used for selection of the menu lines
and for confirmation.
First of all, adjust date and time.
5|
BW-HE
3.2 Menu structure
78°C
100%
Display
50°C
System ok
Description
The controller is operated and controlled via the menu.
During normal operation, the status is displayed.
Note:
The displayed values and options depend on the functions
and only appear if these are available for the adjusted system
parameters.
Adjustment range
Factory setting
Balance/adjust. values
Max. s3
maximum temperature
store, top
heat
heat quantity
oper. hours R1
operating hours relay 1
oper. days
operating days
--adjust values:-Date
Time
Tstmax
maximum store temperature
0 ... 90 °C
60 °C
DTon
switch-on difference
1,0 ... 25,0 K
5,0 K
DToff
switch-off difference
0,0 ... 24,0 K
3,0 K
DTset
set difference
2 ... 50 K
10 K
Off, Auto, Min., Max.
Auto
Relay mode
DTstmax
maximum store hysteresis
0,3 ... 10,0 K
2,0 K
Tstsec
store emergency shutdown temperature
0 ... 95 °C
90 °C
DTstsec
store emergency shutdown
hysteresis
0,3 ... 10,0 K
2,0 K
Tcolsec
collector emergency shutdown
temperature
20 ... 180 °C
130 °C
DTcolsec
collector emergency shutdown
hysteresis
10 ... 50 K
10 K
Yes, No
No
collector cooling
Tcolmax
maximum collector temperature
10 ... 130 °C
110 °C
DTcolmax
maximum collector hysteresis
5,0 ... 20,0 K
5,0 K
collector minimal.
minimum collector function
Yes, No
No
Tcolmin
minimum collector temperature 0 ... 90 °C
10 °C
DTcolmin
minimum collector hysteresis
2,0 K
|6
0,3 ... 10,0 K
© 10341 Roth_BW_HE.monen.indd
--expert:--
BW-HE
Display
Description
Adjustment range
Factory setting
Recooling
Yes, No
No
Frost protection
Yes, No
No
Min. speed
minimum speed
10 ... 100 %
10 %
rise
rise control
1 ... 20 K
2 K
tube collector
Yes, No
No
interval
1 ... 60 min
30 min
runtime
10 ... 1200 s
30 s
start
00:00 ... 23:59
07:00
stop
00:00 ... 23:59
19:00
antifr. type
Tyfo LS, Ethylene, Propylene,
Water
Propylene
antifreeze ratio
20 ... 70 %
40 %
FLOWRATE
1,0 ... 50,0 l/min
3,0 l/min
warning message
Yes, No
No
Non-ret. valve
warning message
Yes, No
No
PWM
pump characteristic
Solar PM 15/80, linear, Off
Solar PM 15/80
expert
Yes, No
No
language
German, English
English
© 10341 Roth_BW_HE.monen.indd
DT too high
7|
BW-HE
3.3
Operation
Adjustment mode
In the adjustment mode, different functions are selected
and values are adjusted. Press button 3 for 2 seconds in
order to access the adjustment menu.
Use button 1 and 2 respectively to select the function to be
activated or the adjustment value and confirm with button 3.
Storage max. temp.
60 °C
0
90
Collector cooling:
Yes
No
Balance / adjust. values:
x
Collector cooling
Tcolmax
∆Tcolmax
110 °C
5,0 K
Adjusting a value:
• Select the value with button 1 or 2, briefly press button 3;
the adjustment range is shown in form of a bar.
• adjust the selected value with buttons 1 or 2; the value is
shown on the bar by means of a slide. Briefly press button
3 to confirm the adjustment.
Press button 3 again in order to store the adjustment
and to get back to the adjustment menu.
If button 3 is not pressed after an adjustment has been
carried out, the display changes back after some seconds. The adjusted value will then not be stored.
Selecting a function or an option:
• Select a function or an option with button 1 or 2, briefly
press button 3.
• Select „Yes“ in order to activate the selected function, select „No“ to deactivate the function.
Briefly press button 3 to confirm the selection.
Press button 3 again in order to store the selection.
An activated function is indicated by means of a marked
checkbox.The corresponding adjustment values are also
displayed.
In order to access the display mode, keep button 3
pressed for 2 seconds.
If no button is pressed in the adjustment mode within 2
minutes, the display automatically changes to show the
status display.
3.4 User code
|8
Code 0077
All display and adjustment values are shown, all
adjustments can be altered.
In order to enter the user code, scroll down in the submenu
„balance and adjustment values“ until you reach the item
„relay mode“, then keep button 2 pressed for 2 seconds.
1
forward
3
SET
(selection-/
adjustment mode)
2
backward
Note:
After the menu item „user code“ has been selected, this
code must be entered.
If the expert user code is not entered, the expert menu will
not be displayed.
If the expert menu is activated, it will be accessible for 60
minutes. If the controller is restarted, the expert menu cannot be accessed. By means of the option „Expert“, in the expert menu, the expert menu can be permanently enabled.
© 10341 Roth_BW_HE.monen.indd
1. Expert
BW-HE
4. Display mode
4.1 Status, measurement values and
balance values
During normal operation, the status is displayed. Briefly press
button 2, measurement and balance values will then be shown.
In order to access the adjustment menu, press button 3 for
2 seconds.
Status and measurement values display
In the status and measurement values display, collector
temperature, base and top store temperature, pump speed
and status are shown.
78°C
100%
System ok
50°C
Balance values
100
Collector today
6
0
12
18
In the balance value display, the following temperature
courses (in °C) are shown one after the other over time.
• collector today
• store today
• collector yesterday
• store yesterday
60
Store today
30
6
12
18
100
Collector yesterd.
6
0
12
18
60
Store yesterd.
30
6
© 10341 Roth_BW_HE.monen.indd
7
12
18
8
Yields in kWh
6
5
3
In this balance value display, the heat yield (in kWh) of the
past 7 days is shown.
4
9|
BW-HE
4.2
Balance values
167
Operating days
1075 h
Operating hours R1
16372 kWh
Heat
94 °C
Max. upper storage
Maximum store temperature
Display of maximum store temperature (at the top, in °C)
since commissioning or latest reset.
Heat quantity
Display of heat yield in kWh and MWh respectively since
commissioning or latest reset.
Operating hours
Display of operating hours of the solar pump in h since
commissioning or latest reset.
Operating days
Display of operating days since commissioning.
1
forward
The balance values can be reset in the balance and adjustment menu.
3
SET
(selection-/
adjustment mode)
• Keep button 3 pressed for 2 seconds. This changes the
display to show the balance values and adjustment values.
2
backward
• Select the balance value which is to be reset with buttons 1 and 2 and briefly press button 3. The value is then
reset to 0.
5.Functions and options
Store loading
DTon
adjustment range 1,0 ... 25,0 K
factory setting 5,0 K
If the adjusted switch-on difference "DTon“ between collec­
tor and store is exceeded, the store will be loaded. If this
difference falls below the adjusted switch-off difference
"DToff“, the loading function will be switched off.
adjustment range 0,0 ... 24,0 K
factory setting 3,0 K
Loading of the store will also be switched-off or suppressed
if the collector is blocked (see collector minimum limitation)
or if the store is at maximum limitation.
DToff
Store maximum limitation
Tstmax
adjustment range 0 ... 90 °C
factory setting 60 °C
If the adjusted maximum temperature „Tstmax“ is exeeded,
the loading of the store is stopped. If the store cools down
by more than 2 K (hysteresis), the store will be loaded
again.
DTstmax
Store emergency shutdown
Tstsec
adjustment range 0 ... 95 °C
factory setting 90 °C
DTstsec
adjustment range 1,0 ... 10,0 K
factory setting 2,0 K
| 10
If the cooling options are activated (e.g. collector cooling),
the store will be loaded beyond the adjusted maximum
temperature.
In order to avoid too high temperatures in the store, the
emergency shutdown of the store is additionally provided,
which also blocks the store for the cooling options. If the
store temperature reaches the adjusted value „Tstsec“, the
emergency shutdown is activated.
© 10341 Roth_BW_HE.monen.indd
adjustment range 1,0 ... 10,0 K
factory setting 2,0 K
BW-HE
Collector cooling function
collector cooling
The collector cooling function starts, when the adjusted
maximum collector temperature is reached. If this temperature is underrun by the adjusted hysteresis, this function
is switched off.
TColmax
The collector is cooled via heat transfer to the store.
adjustment range 10 ... 130 °C
Werkseinstellung 110 °C
The pump output (provided that it is activated) is controlled
with maximum relative pump speed.
adjustment range 5,0 ... 20,0 K
factory setting 5,0 K
Note:
The maximum collector temperature „Tcolmax“ can be 10 K lower than the collector
emergency shutdown temperature and 10 K
higher than the maximum store temperature
(blocking).
selection „Yes“, „No“
factory setting: „No“
DTColmax
Collector emergency shutdown
Tcolsec
At high collector temperatures (depending on system pressure or antifreeze concentration etc.) the systems stagnates.
This means that solar loading is not possible.
DTcolsec
If the adjusted temperature threshold „Tcolsec“ is exceeded, the collector will no longer be used for loading.
adjustment range 20 ... 180 °C
factory setting 130 °C
adjustment range 10 ... 50 K
factory setting 10 K
Collector minimum limitation
ColleCtor minimal.
selection: „Yes“, „No“
factory setting: „No“
A collector is considered to be blocked, if it has not reached the
adjusted minimum temperature or if the „collector blocked“
condition is fulfilled.
tcolmin
adjustment range 0... 90 °C
factory setting 10 °C
DTcolmin
adjustment range 0,3... 10,0 K
factory setting 2,0 K
Recooling
recooling
selection: „Yes“, „No“
factory setting: „No“
If the adjusted maximum store temperature has been reached,
the solar pump remains on in order to prevent the collector from being overheated. During this process, the store
temperature may increase, but only up to the adjusted store
emergency shutdown temperature.
© 10341 Roth_BW_HE.monen.indd
In the evening, the system remains on until the store has
been cooled down to its adjusted maximum store temperature via the collector and the pipework.
Frost protection
Frost protection
selection: „Yes“, „No“
factory setting: „No“
As soon as the temperature at the collector is 4 °C, the frost
protection function operates the loading circuit between the
collector and the store in order to protect the medium in
the loading circuit against freezing or coagulation.
If the collector temperature exceeds 5 °C, this function is
switched-off.
The pump output uses maximum pump speed.
11 |
BW-HE
Antifreeze type
antifr. type
Adjustment channel for the heat transfer fluid used.
Antifreeze ratio
antifreeze ratio
Adjustment channel for the glycol concentration in the heat
transfer fluid. The concentration of proylene-glycol in the
water-glycol mixture should not exceed 50 %.
Flow rate
Flow rate
Adjustment channel for the value (in l/min) read from the window of the FlowCheck (at 100% pump speed). The solar heat
quantity calculation uses this value as well as the values entered
in the antifreeze type and concentration channels. S1 and S2 are
used as the reference sensors (flow/return).
Tube collector function
tube collector
This function helps overcome non-ideal sensor position
with some tube collectors and compensates for the delayed
temperature measurement.
selection „Tyfo LS“, „Ethylene“, „Propylene“, „Water“
factory setting: „Propylene“
adjustment range 20 ... 70 %
factory setting 40 %
adjustment range 1,0 ... 50,0 l/min
factory setting 3,0 l/min
selection: „Yes“, „No“
factory setting: „No“
interval
adjustment range 1 ... 60 min
factory setting 30 min
runtime
This function operates within a given time frame (“start“
and “stop“). It activates the collector circuit pump for 30
seconds (adjustable via the parameter “runtime“) every 30
minutes at collector standstill (adjustable via the parameter
“interval“).
adjustment range 10 ... 1200 s
factory setting 30 s
If the collector sensor is defective or if the collector is blocked,
this function is suppressed or switched-off.
start
The collector circuit is operated at minimum pump speed.
adjustment range 00:00 ... 23:59
factory setting 07:00
stop
Speed control
Min. speed
adjustment range 10 ... 100%
factory setting 10 %
DTset
adjustment range 2 ... 50 K
factory setting 10 K
rise
adjustment range 1 ... 20 K
factory setting 2 K
| 12
The controller is equipped with a PWM output for con­
trolling a high-efficiency pump. Relative pump speed is
adapted in 1%-steps to the current temperature difference
between collector and store bottom.The parameter "DTset“
is used as a set value for pump speed control.The parameter
„rise“ determines at which change of temperature difference
(“rise“ divided by 10) the speed will be increased. In some
cases, it is necessary to increase the factory setting of the
minimum pump speed (10%).
© 10341 Roth_BW_HE.monen.indd
adjustment range 00:00 ... 23:59
factory setting 19:00
BW-HE
Relay mode
Relay mode
In this menu, the relay can be set into different modes:
• Off
• Auto
• Min. (minimum speed)
• Max. (maximum speed)
If "Off", "Min." or "Max." is selected, the
symbol will be
shown on the status display.
Pump characteristic
High-efficiency pumps convert the PWM signal in different
ways and independently of the speed measured by the con­
troller and indicated on the display. At 90% pump speed,
pumps with the Solar PM characteristic provide additional
power (booster function). Pumps with a linear characteristic have continuously increase in power.
selection „Off“, „Auto“, „Min.“, „Max.“
factory setting „Auto“
PWM
selection „Solar PM 15/80“, „linear“, „Off“
factory setting „ Solar PM 15/80“
6.Messages
In the case of an error, a message is shown in the status
display. If there are several messages, only the message
having the highest priority is shown in the status display. All
other recently detected errors and messages respectively
are listed above the balance values (keep button 3 pressed
for 2 seconds).
Defective sensors
Defective sensors are shown in the status display.
broken
0%
broken
Warning non-return valve
© 10341 Roth_BW_HE.monen.indd
non-ret. valve
Error
S1 defect.
The defective sensor is indicated:
If the cable of a temperature sensor is broken, „broken“
is displayed, if the cable of a temperature sensor is shortcircuited, „short“ is displayed.
This message is shown if between 10 p.m. and 5.00 a.m. a
store is loaded.
selection„Yes“, „No“
factory setting „No“
The alam message is released, when the condition men­
tioned above is fulfilled for at least 1 minute. This prevents
the alarm message from being released by short-term
disturbances.
Warning „DT too high“
This message is shown, if solar loading has been carried out
for a period of 20 minutes with a differential higher than
50 K.
DT too high
selection„Yes“, „No“
factory setting„No“
13 |
BW-HE
7. Troubleshooting
Pump starts for a short moment, switches-on/off
again,etc.
No indication is made on the display.
Check the power supply. Is it disconnected?
no
Is the temperature difference at the controller
too small?
yes
The fuse of the controller
could be blown. It can be
replaced after the front
cover has been removed
(spare fuse is enclosed in
the accessory bag).
Check the supply line and
reconnect it.
no
yes
Is the collector circuit
blocked at the dirt trap?
yes
Wrong position of the
collector sensor?
Pump is overheated, but no heat transfer from the collector to the store, flow and return have the same temperature; perhaps also bubble in the lines
Air in the system?
no
Vent the system; in­crease
system pressure to at
least static primary pressure plus 0,5 bar; if necessary increase the pressure,
switch the pump on and
off for a short time
no
yes
Plausibility control of the
tube collector function
Change ∆T on and ∆T off
correspondingly.
no
o.k.
Mount the collector sensor at solar flow (warmest
collector output); use the
immersion sleeve of the
respective collector.
The temperature difference between the store and the
collector increases enormously during operation; the
collector circuit cannot divert the heat.
Collector circuit pump
defective ?
yes
no
yes
Clean the dirt trap
Check / replace it
Pump starts up very late.
Heat exchanger calcified?
no
Switch-on-temperature
difference ∆Ton too
large?
yes
Decalify it
Change ∆T on and ∆Toff
correspondingly
Non-ideal position of collector sensor (e.g. flatscrew
sensor instead of sensor in
immersion sleeves?)
yes
no
yes
Clean it
Activate tube collector
function if necessary.
o.k.
| 14
Heat exchanger blocked?
Heat exchanger too
small?
yes
Replace with correctly
sized one
© 10341 Roth_BW_HE.monen.indd
no
yes
BW-HE
a
Stores cool down at night.
b
Check the non-return
valve in warm water circulation- o.k.
Does the collector
circuit pump run in the
night?
no
Check controller.
yes
At night, the collector
temperature is higher
than the outdoor temperature.
no
yes
yes
Check the non-return
valve in flow and return
pipe with regard to the
functional efficiency.
Sufficient store insulation?
yes
no
Increase insulation.
no
Replace insulation or increase it.
Are the store connections insulated?
yes
no
Warm water flow upwards?
no
yes
© 10341 Roth_BW_HE.monen.indd
no
yes
Circulation pump and
blocking valve should be
switched-off for 1 night;
less store losses?
yes
a
no
The gravity circu­lation in
the circulation line is too
strong; insert a stronger
valve in non-return valve
or an electric 2-port valve behind the circulation
pump; in pump operation,
the 2-port valve is open,
other­wise it is closed, conect pump and 2-port
valve in parallel; activate
circulation again!
Does the control LED
flash?
yes
Clean or replace
no
No current; check fuses
/ replace them and check
power supply.
Insulate the connections.
Change connection and
let the water flow sidewards or through a siphon
(bow downwards); less
store losses now?
no
Does warm water circulation run for a very long
time?
no
The solar circuit pump does not run although the collector
is significantly warmer than the store.
Insulation close enough
to the store?
yes
Further pumps which are
connected to the solar
store must also be checked.
Does the pump start up
in manual operation?
no
yes
Is the pump current released by the controller?
yes
o.k.
The adjusted temperature
difference for starting the
pump is to high; choose a
value which makes more
sense.
Is the pump stuck?
no
yes
Use the circulation pump
with timer and switch-off
thermostat (energy efficient circulation)
yes
Turn the pump shaft using
a screwdriver; now passable?
no
Check whether the pumps
of the after-heating circuit runs at night, check
non-return valve; problem
solved?
no
b
Are the controller fuses
o.k.?
no
Replace the fuses.
Pump is defective - replace it
yes
Controller might be defective - replace it.
15 |
BW-HE
8. Accessories
Sensors
Our product range includes high-precision platinum temperature sensors, flatscrew sensors, cylindrical clip-on sensors
and other temperature sensors, also as complete sensors
with immersion sleeve.
Overvoltage protection device
In order to avoid overvoltage damage at collector sensors
(e.g. caused by local lightning storms), we recommend installing the overvoltage protection SP10.
© 10341 Roth_BW_HE.monen.indd
Flowmeter
If you wish to carry out a heat quantity measurement,
you need a flowmeter for measuring the flow rate in your
system.
| 16
© 10341 Roth_BW_HE.monen.indd
BW-HE
17 |
© 10341 Roth_BW_HE.monen.indd
BW-HE
| 18
© 10341 Roth_BW_HE.monen.indd
BW-HE
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